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A semi-physical sediment yield model for estimation of suspended sediment in loess region

International Journal of Sediment Research 2017年第1期32卷 12-19页

作者： Wei Si Weimin Bao Peng Jiang Liping Zhao Simin Qu Business School of Hohai University College of Hydrology and Water Resources Hohai University Division of Hydrologic Sciences Desert Research Institute

Sediment yield is a complex function of many environmental factors including climate,hydrology,vegetation,basin topography,soil types,and land *** present a new semi-physical watershed sediment yield model for the estimation of suspended sediment in loess *** model is composed by three modules in slope,gully,and stream *** slope sediment yield,a balance equation is established based on the concept of hydraulic erosion capacity and soil erosion resistance *** to the statistical analysis of watershed characteristics,we use an exponential curve to approximately describe the spatial variability of watershed soil erosion resistance *** gully phase,the relationship between gully sediment concentration and flow velocity is established based on the Bagnold’ stream power *** the stream phase,we assume a linear dependence of the sediment volume in the reach on the weighted sediment input and *** proposed sediment yield model is operated in conjunction with a conceptual hydrologic model,and is tested over 16 regions including testing grounds,and small,medium and large watersheds in the loess plateau region in the mid-reach of Yellow *** results indicate that the model is reasonable in structure and is able to provide a good simulation of sediment generation and transportation processes at both flood event scale and inter-annual time *** proposed model is generally applicable to the watersheds with soil texture similar to that of the loess plateau region in the Yellow River basin in China.

关键词： Hydraulic erosion capacity erosion resistance capacity Sediment yield Suspended sediment Loess region

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